Your question is unclear.
To call from Australia to Venice, Italy, dial 0011 39 and then the Italian number. Note that landline numbers in Italy begin with 0, and you do not drop the leading 0 from the Italian number in international format. For example, for Venice, dial 0011 39 041 and then the local number. Italian mobile numbers begin with 0011 39 3.
To call from Italy to Australia, dial 00 61 and then the Australian number, but do drop the leading 0 from the Australian number. For example, for Sydney, dial 00 61 2 and then the local number.
The dialing code for Australia when calling from the USA is 61.
0061 - no that's for calling Australia from New Zealand. The answwer is 0064
The country code for Sweden is +46, no matter where you're calling from.
Germany is country code +49.
Country code +354 is Iceland.
The country code and area code of Central East Australia, Australia is 61, (0)2.
The country code and area code of South East Australia, Australia is 61, (0)3.
To call Australia from the US using Verizon, dial the international access code (011), followed by Australia's country code (61), then the area code and phone number in Australia. Make sure you have an international calling plan with Verizon to avoid additional charges.
Colombia is country code +57.
pakistan
The country code for North America (USA, Canada, etc.) is +1. The area code for Houston is 713, 281, or 832. Area code 346 will be added as a further overlay in 2014. The plus sign means "insert your international access prefix here." From Australia, that prefix is usually 0011.
You need to know what time it is in Australia. Who ever you are calling should know that you are calling them. The international access code is 011. After the other code is 61. Dial both of those numbers and that is it.